Finding and Using the Right Parts Diagram for Your Weber Genesis S 330
The Weber Genesis S 330 is a three-burner gas grill that's been around long enough to have a fairly straightforward parts layout, but finding the actual diagram online can still be a chore if you don't know where to look. Most people end up clicking through a dozen dealer websites before landing on something that actually works. I've done it enough times that I can walk you through the whole thing without wasting either of our time. The most reliable place to get an official diagram is directly from Weber's website. Go to weber.com, click on Support, then Parts & Accessories. You can search by model number, and the S 330 comes up under the Genesis II E-Series or sometimes just Genesis line depending on your exact production year. Weber gives you a downloadable PDF for each sub-model, which includes an exploded-view image and a parts list with corresponding part numbers. This is your primary reference when ordering replacement components. If the official site isn't cooperating for some reason, several authorized Weber dealers host mirror copies of these diagrams. Sites like BBQ Depot, Parts Town, and even some regional dealer portals carry them. The diagrams themselves are identical regardless of where you pull them from, so pick whichever loads fastest.
The diagram breaks down into roughly six main sections: the lid assembly with thermometer and latch, the cooking grid and flavorizer bars, the burners themselves (main and rear rotisserie), the primary valvetrain and gas manifold, the cart base with heat shield and grease management system, and the side tables with mounting hardware. Each section has its own sub-list with part numbers. You'll want to note which section a part belongs to before ordering, because Weber's part numbering system isn't always intuitive. I ran into a specific issue last year that illustrates why having the right diagram matters. My rear burner stopped lighting properly. I assumed it was a clogged port and started poking at it with a paperclip, which did nothing. Turns out the igniter electrode on that rear burner had shifted position and was sitting too far from the burner lip. The diagram showed the exact gap specification — about a quarter inch — and the mounting bracket configuration. I loosened the bracket, repositioned the electrode, and tightened it back down. Fixed it in maybe ten minutes. Without the diagram, I would've kept fiddling with the burner ports like an idiot. Another thing that trips people up: Weber updated the Genesis S 330 mid-production around 2018. The earlier models use a different flavorizer bar shape and a slightly different burner mounting system compared to the later ones. If you order parts without cross-referencing your serial number against the diagram, you might end up with pieces that don't fit. Check the serial number plate on the left side of the cart, near the propane connection. It's usually stamped on a small metal tag. Weber's parts lookup tool asks for this, and it should steer you toward the correct sub-model diagram.
Here are a few practical things to keep in mind when you're working from the diagram: The flavorizer bars are one of the most commonly replaced parts on this grill, and they're also the most straightforward swap. They just lift out. But if yours are warped or missing tabs, you'll get uneven heat distribution across the cooking surface. The diagram shows the correct part numbers for both left and right bars — they're not always symmetrical, so don't assume you can flip one end to end. The igniter system is another area where the diagram helps a lot. The piezo igniter button on the control panel connects via a wire to each burner's electrode. The diagram shows the routing path, which makes troubleshooting significantly easier. If one burner won't spark, trace the wire from the electrode back to the box on the console. Most failures are a loose connection or a cracked insulator, not a dead igniter module.
Get the Full Details
One counter-intuitive detail that most people miss: the grease management system on the S 330 uses a drip tray that sits underneath the flavorizer bars, and Weber changed the tray design between the 2014 and 2017 model years. The older trays had a different lip configuration that doesn't seat properly in the newer cart frame. If you're swapping parts across years, verify the tray part number separately rather than assuming compatibility from the diagram alone. The diagram might show the tray in the same general area, but the actual dimensions differ. For downloading, the official PDF is usually available as a single file around 2 to 4 megabytes. It's high resolution, so you can zoom in on individual fastener sizes if needed. I'd recommend saving it to your phone or tablet rather than printing it — you'll be referring to it at the grill, and a printed copy tends to get singed or greasy within a few months of cabinet storage near the kitchen or patio. If you run into a part that's discontinued, which does happen with older S 330 models, Weber's customer service can sometimes point you toward aftermarket equivalents. The primary valves and igniters are standard enough that third-party suppliers carry compatible versions. Just make sure the dimensions match what's in the diagram before buying anything non-OEM. A valve that's off by a millimeter on the inlet side can cause gas flow issues that are hard to diagnose later.
The whole process of identifying and ordering parts using the diagram typically takes about 15 to 20 minutes for someone who's done it a few times. First time through, budget closer to 45 minutes because you'll be cross-referencing serial numbers and verifying sub-model variations. It's not complicated, but it requires attention to detail, and that's where most people rush and order the wrong thing. There are scenarios where the diagram approach breaks down entirely. If your grill has been modified — aftermarket grates, third-party heat tents, non-standard burner replacements — the diagram won't account for those changes. In that case, you're better off measuring the existing parts directly rather than trying to map them back to Weber's specifications. It's slower, but it prevents ordering parts that were never meant to fit your setup. The official Weber parts diagram for the Genesis S 330 can be found at weber.com/support/parts-and-accessories by searching "Genesis S 330" or entering your serial number directly. That's the starting point for everything else.
